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3.40  Repairing Oil Leaks

3.41  Location, Cause and Effect

 

Oil leaks may develop wherever two mating faces are sealed with a gasket.  Such seams may fail as the result of 

 

deterioration of the gasket material, loosening of the screws caused by temperature variations, or improper care 

 

as the result of previous reassembly.  Typical gaskets seams in a mechanical pump are located at the oil level 

 

window, the shaft seal, the oil drain, and the mating faces of such mechanical surfaces as the intake chamber 

 

cover, the oil case, and the exhaust chamber cover.  The importance of a gasketed seam is determined principally 

 

by its function.  If it is a vacuum seal, the ultimate performance of the pump is dependent upon it.  If it is an oil 

 

seal, the pump may be operated satisfactorily for some time without loss of function.  Eventually, of course, a 

 

great loss of oil may cause harmful damage.

3.402  Repairing Techniques

 

An oil seam may be sealed by any of several methods.  When an O-ring is employed, the surfaces of the O-ring 

 

and its groove should be wiped clean.  If the O-ring is not badly deformed or scratched it may be reused by

 

sealing with a slight film of vacuum oil or vacuum grease.  Thin composition gaskets are generally used for large 

 

irregularly shaped areas.  A replacement joint of this type should be thoroughly cleaned of all previous gasket 

 

material and the mating surfaces cleaned of any nicks.

3.50  Repairing Vacuum Leaks

3.501  Surface Preparation

 

Good Vacuum seals are an essential and important attribute of a good mechanical pump.  A good seal is dependent

  

upon the quality of the mating surfaces as well as the sealant and its preparation.  The mating faces should be 

 

carefully inspected for any projections or foreign particles which might interfere with proper mating.  Slight 

 

projections such as nicks and burrs are most easily removed by rubbing with a fine abrasive stone.  The surface of 

 

the mating parts may be washed with a solvent or alcohol after which they must be thoroughly dried.

3.502  Temporary Repair

 

Temporary vacuum repairs are often made by covering the known leak with an industrial sealant such as Loctite 

 

with Teflon.  Such a practice, however, is not recommended for seals of a  permanent nature.

3.60  Drive Problems

 

If for any reason the pump will not operate, turn off the power and check the fuse and electrical connections.

 

Then try the power to the motor only by removing the belt.  If the motor operates properly try hand-rotating the 

 

pump in the proper direction with the pump intake port open.  If both turn freely then replace the belt and check 

 

the belt tension.  The tension should be sufficient to drive the pump without visible slippage.  Any greater tension 

 

will cause noise and possible damage to the bearings of both the motor and pump.  Make certain that both pulley 

 

grooves are clean and free from oil.  The pulleys must be fastened securely on their respective shafts, and in 

 

parallel alignment.

Содержание WELCH DUOSEAL 1397B-01

Страница 1: ...of the pump body bursting and causing possible injury to personnel in the area Gardner Denver Inc Welch Vacuum Technology 5621 W Howard Street Niles IL 60714 Phone 847 676 8800 Fax 847 677 8606 Techn...

Страница 2: ...ons are found where failure to observe the instruction could result in damage to the equipment associated equipment and process These units confirm to the SI International system of units of measureme...

Страница 3: ...vel 10 3 30 Shaft Seal Replacement 10 3 40 Repairing Oil Leaks 11 3 50 Repairing Vacuum Leaks 11 3 60 Drive Problems 11 Section 04 Trouble Shooting Guide 4 10 Poor Vacuum Readings 12 4 20 Noisy Pump 1...

Страница 4: ...SEAL pumps should be mounted in a horizontal plane 1 122 Unmounted Pumps If you have purchased an unmounted pump refer to parts list for information concerning the motor motor pulley and belt necessar...

Страница 5: ...e gas flow is substantially molecular in character The gas flow is then dependent upon the kinetic activity of the molecules to bring it to the intake of the pump 1 162 The Effects of Conductance It h...

Страница 6: ...e yourself with the function and action of the pump which you have now required Remove the intake and exhaust port plugs and temporarily provide a stopper for the intake and a dust cap for the exhaust...

Страница 7: ...f the volume of the mixture this depending upon the amount of air added condensation of the vapor is wither entirely avoided or substantial reduced 2 223 Pump Function With Gas Ballast In a pump funct...

Страница 8: ...rich in hydrogen and observing a sudden change in pressure on an electrical gauge The difference in calibration of these gauges for air and other gases will produce a distinct change in the pressure...

Страница 9: ...a system must be thoroughly clean If the system is completely clean and free from leaks and unwarranted vacuum problems still exist the pump should be checked A simple criterion for the condition of a...

Страница 10: ...rubber stopper Turn the pump on and run the pump for 10 minutes Close the gas ballast 8 Check the vacuum reading of the pump by connecting a thermocouple gauge tube to the pump s intake If the pump is...

Страница 11: ...ng surfaces cleaned of any nicks 3 50 Repairing Vacuum Leaks 3 501 Surface Preparation Good Vacuum seals are an essential and important attribute of a good mechanical pump A good seal is dependent upo...

Страница 12: ...t a forced oil flush 5 If noise level is still unsatisfactory consult with WELCH Technical Service at 847 676 8800 Ext 1 4 30 Excessive Oil Mist 1 Check oil level Maintain the level between the two li...

Страница 13: ...0Hz Electrical Requirements 3 1 Phase Replacement Parts Part No Shaft Seal Lip Seal 1401F 01 Shaft Seal Mechanical Seal 1401F Dust Cap for Exhaust 41 1501 Air Filter Screen 41 0937 Intake Chamber Cove...

Страница 14: ...14 Section 6 DIMENSIONAL DRAWING 1397B 01...

Страница 15: ...ange High RPM direct drive vacuum pumps on the other hand experience a rapid fall off of pumping speed below 100 microns A comparison of the DuoSeal pumping speed curves shown below versus high RPM pu...

Страница 16: ...16 Section 8 EXPLODED VIEW...

Страница 17: ...1 61 8691 INTAKE RING LARGE FINISHED 70 1 61 8693 INTAKE CHAMBER WELCH GRAY 71 2 61 8712 1 1 O RING 372 VITON N S 1401F 1 1 MECHANICAL SEAL KIT N S 1 99 5282 1 1 SEALANT 6cc Item Qty P N A B Descripti...

Страница 18: ...18 VIEW AND PARTS LIST FOR MODEL 41 1482 Parts List for Model 41 1482 Item Qty P N Description 1 1 41 1482 Oil Case Machined for 1397 2 2 41 3753 Oil Case Window 3 1 61 2278 Drain Valve...

Страница 19: ...onnection kit Cat No 141601 for models1400 1405 1376 1380 1402 Standard Exhaust Filter Use with pump model Dimension Catalog Number Diameter Height Filter Replacement Element 1392 1399 1400 1376 1380...

Страница 20: ...Height A2 Cat No 1 NW16 to 4 CFM 140 L min 3 75 5 25 8 25 541001 Stainless Steel Element for ISO NW 16 Trap 1 541921 Stainless Steel Element for ISO NW 25 and NW 40 Traps1 541922 Removable 3 quarter...

Страница 21: ...significant adverse health effects are expected to occur upon short term exposure to this product Aspiration of liquid into the lungs can cause severe lung damage or death Eye Contact Minimal eye irri...

Страница 22: ...ir Eye Contact Check for and remove contact lenses Flush eyes with cool clean low pressure water while occasionally lifting and lowering eyelids Seek medical attention if excessive tearing redness or...

Страница 23: ...ct recovery or disposal Prevent entry into waterways or sewers In urban area cleanup spill as soon as possible In natural environments seek cleanup advice from specialists to minimize physical habitat...

Страница 24: ...c vapor respirator equipped with a dust mist prefilter should be used Protection factors vary depending upon the type of respirator used Respirators should be usedin accordance with OSHA requirements...

Страница 25: ...product However if spilled this product and any contaminated soil or water may be harmful to human animal and aquatic life Also the coating action associated with petroleum and petroleum products can...

Страница 26: ...rd categories No SARA 311 312 Hazard categories identified SARA 313 This product contains the following components in concentrations above the minimis levels that are listed as toxic chemicals in 40 C...

Страница 27: ...for Research on Cancer NTP National Toxicology ProgramNIOSH National Institute of Occupational Safety and Health OSHA Occupational Safety and Health Administration NPCA National Paint and Coating Man...

Страница 28: ...um Technology and receipt or possession does not convey any rights to loan sell or otherwise disclose said information reproduction or use of said information for any purpose other than that in connec...

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